DUAL BAND PASS FILTER AND BAND STOP FILTER USING DUPLEXER OR DIPLEXER

摘要

A dual band pass filter and a band stop filter are provided to simplify configuration of the band pass and band stop filters and to improve skirt characteristics by using a duplexer or a diplexer instead of a matching circuit. A dual band pass filter includes an input terminal(IN), a duplexer(200), a first matching circuit(210), a second matching circuit(220), and an output terminal(OUT). An external signal is received through the input terminal. The duplexer is connected to the input terminal to receive the signal from the input terminal. The duplexer has two pass bands. The first matching circuit is connected to a first output terminal of the duplexer. The second matching circuit is connected to a second output terminal of the duplexer. The output terminal couples the output terminal from the first matching circuit with the output terminal of the second matching circuit. The output terminal outputs the signal from the output terminals of the first and second matching circuits.